﻿using System;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Razor.TagHelpers;

namespace Cities.Infrastructure.TagHelpers {

    [HtmlTargetElement(Attributes = "show-for-action")]
    public class SelectiveTagHelper : TagHelper {

        public string ShowForAction { get; set; }

        [ViewContext]
        [HtmlAttributeNotBound]
        public ViewContext ViewContext { get; set; }

        public override void Process(TagHelperContext context,
                                     TagHelperOutput output) {

            if (!ViewContext.RouteData.Values["action"].ToString()
                    .Equals(ShowForAction, StringComparison.OrdinalIgnoreCase)) {
                output.SuppressOutput();
            }
        }
    }
}
